SEBS与常用单质炸药的相容性研究

Compatibility between SEBS and Commonly Used Single-Compound Explosives

将分子动力学(MD)模拟方法中理论键长变化趋势与差示扫描量热法(DSC)测得的分解温度变化情况相结合,分析了热塑性弹性体氢化苯乙烯-丁二烯-苯乙烯嵌段共聚物(SEBS)与推进剂中常用的单质炸药黑索今(RDX)、奥克托今(HMX)、六硝基六氮杂异伍兹烷(CL-20)之间的相容性。MD模拟结果表明:RDX、HMX、CL-20与SEBS共混体系的引发键最大键长随温度的升高而增加,与单质炸药单组分体系相比均没有明显的变化,推测SEBS与RDX、HMX、CL-20共混后稳定性较好,不易发生引发键的断裂。DSC结果中,RDX、HMX、CL-20与SEBS共混后,热分解温度变化均在3℃以内,表明SEBS与RDX、HMX和CL-20之间相容性好。进一步,选择相容性差的二号中定剂(C_(2))和3,4-二硝基呋咱基氧化呋咱(DNTF)作为对照体系,进行MD模拟和DSC分析发现,引发键最大键长明显增加,DSC热分解温度提前了70℃以上,验证了引发键键长预测相容性优劣的可行性。

The compatibility between thermoplastic elastomer hydrogenated styrene-butadiene-styrene block copolymers(SEBS)and single-compound explosives hexogen(RDX),octogen(HMX)and hexanitrohexaazaisowurtzitane(CL-20)commonly used in solid propellants was studied by using theoretical trigger bond length trends in molecular dynamics(MD)simulation and decomposition temperature changes in differential scanning calorimetry(DSC)measurements.The results of MD simulation show that the maximum trigger bond length of RDX,HMX and CL-20 in explosive/SEBS blend systems increases with temperature.Compared to the single-component explosive systems,the maximum trigger bond length changes little after blending with SEBS.It is speculated that RDX,HMX,and CL-20 all have good stability after blending with SEBS and is less prone to cause trigger bond fracture.In DSC results,after blending with SEBS,the thermal decomposition temperature changes of RDX,HMX and CL-20 are less than 3℃,indicating that the compatibility of SEBS with RDX,HMX and CL-20 is good.Furthermore,a system of 1,3-dimethyl-1,3-diphenylurea(C_(2))and 3,4-dinitrofurazanfuroxan(DNTF)with poor compatibility was chosen as the control system for MD simulation and DSC analysis.The maximum trigger bond length significantly increases,and the decomposition temperature in DSC decreases by more than 70℃,which verifies the feasibility of predicting the compatibility by using trigger bond length.